Description : Which one of the following generally acts as an antagonist to gibberellins? (a) Zeatin (b) Ethylene (c) ABA (d) IAA
Last Answer : (c) ABA
Description : Hormone primarily connected with cell division is (a) IAA (b) NAA (c) cytokinin/zeatin (d) gibberellic acid.
Last Answer : (c) cytokinin/zeatin
Description : The hormone responsible for apical dominance is (a) IAA (b) GA (c) ABA (d) Florigen.
Last Answer : (a) IAA
Description : Seed potato dormancy is broken by ? a IAA b NAA c Thiourea d CCC
Last Answer : c Thiourea
Description : Which of the following statement is correct? (1) The causal organism for foolish seedling disease is the source of gibberellin (2) Abscisic acid is a growth promoter (3) The ratio of auxin : cytokinin control cell differentiation (4) Bolting of cabbage can be induced by treatment with IAA
Last Answer : Ans. ((d))
Description : You are given a tissue with its potential for differentiation in an artificial culture. Which of the following pairs of hormones would you add to the medium to secure shoots as well as roots? ... gibberellin (b) Auxin and cytokinin (c) Auxin and abscisic acid (d) Gibberellin and abscisic acid
Last Answer : (b) Auxin and cytokinin
Description : The Avena curvature is used for bioassay of (a) IAA (b) ethylene (c) ABA (d) GA3.
Description : Plant growth regulator used for sucker control in Tobacco is a. IAA b. ABA c. GA d. MH
Last Answer : d. MH
Description : During seed germination, its stored food is mobilized by (a) ABA (b) gibberellin (c) ethylene (d) cytokinin.
Last Answer : (b) gibberellin
Description : Seed dormancy is due to the (a) ethylene (b) abscisic acid (c) IAA (d) starch.
Last Answer : (b) abscisic acid
Description : Dormancy is a function of interaction of growth promoter like GA and growth inhibitor like _________: a. ABA b. Cycocell c. Alar d. Paclobutrazole
Last Answer : ABA
Description : ABA is involved in (a) shoot elongation (b) increased cell division (c) dormancy of seeds (d) root elongation.
Last Answer : (d) root elongation.
Description : To break the tuber dormancy, the tuber should be treated with
Last Answer : Ans.1%thiourea + 1 ppm GA3 for 1 hour
Description : Which of the following plant hormone was first isolated from a fungus? (a) Ethylene (b) Gibberellic acid (c) Kinetin (d) Zeatin
Last Answer : Ans:(b)
Description : Consider the following pairs Plant hormone Function/Effect 1. Indole-3 acetic acid - Rooting in cuttings 2. Gibberellic acid - Stomatal closure 3. Ethylene - Fruit ripening 4. Zeatin - Cell division Which of the above pairs are correctly matched ... 3 (b) 1, 2, and 4 (c) 2 and 4 (d) 1, 2, 3, and 4
Description : One of the commonly used plant growth hormone in tea plantations is (a) ethylene (b) abscisic acid (c) zeatin (d) indole-3-acetic acid.
Last Answer : d) indole-3-acetic acid.
Description : For berry elongation in Grape ____ hormone is used a. IAA b. IBA c. GA3 d. ABB
Last Answer : c. GA3
Last Answer : Gibberellin hormone causes stem overgrowth
Description : Hormone used in tissue culture for better growth is: (1) Auxin (2) Gibberellin (3) Cytokinin (4) Vernalin
Description : The hormone responsible for ripening of fruits is (a) Ethylene (b) Cytokinin (c) Auxin (d) ABA
Last Answer : Ans. ((a))
Description : The hormone reducing transpiration rate by inducing stomatal closure is: (a) ABA (b) Ethylene (c) Cytokipin (d) Auxin
Description : During propagation through cuttings, which hormone(s) is/are used for root promotion? a. ABA b. Seradix c. NAA d. All above
Last Answer : Seradix
Description : Abscisic acid (ABA) is natural plant hormone, which: a. Promote the growth b. Initiate the ripening c. Induce the fruit maturity d. retards the growth
Last Answer : retards the growth
Description : A plant hormone, which is primary regulator of abscission process is (a) Ethylene (b) Auxin (c) ABA (d) Gibberellins
Description : Hormone responsible for senescence is (a) ABA (b) auxin (c) GA (d) cytokinin.
Last Answer : (a) ABA
Description : Why is potato tuber considered as a stem although it is an underground plant part? -Biology
Last Answer : answer:
Description : The type of crop which is able to fix nitrogen from air is known as (a) Legume (b) Rice (c) Tuber (d) Potato
Last Answer : Ans: (a)
Description : The tuber borne disease of potato
Last Answer : Ans. Black scurf (Rhizoctonia solani)
Description : The scientific name of Potato tuber moth
Last Answer : Ans. Phthorimaea operculella
Description : Tuber for selected for potato sowing should have
Last Answer : Ans.At least 3 buds, 2.5-3 cm diameter with 25-30 gm weight.
Description : Which of the following is not a stern modification? (1) Bulb of Onion (2) Corm of Arvi (3) Tuber of Sweet-potato (4) Tuber of Potato
Last Answer : (3) Tuber of Sweet-potato Explanation: A modified stem is a part of a plant with special features developed for special functions. Modified stems can be found either above or below ground. Examples of ... ; bulbs, corms, rhizomes, tubers and tendrils. Sweet potato is an example of a tuberous root.
Description : A potato tuber has been cut into two halves. A few drops of iodine solution are placed on the cut surface of one of the halves. What colour change will be noticed? (1) From brown to blue-black (2) From brown to orange-red (3) From blue to pink (4) From pink to blue-green
Last Answer : (1) From brown to blueblack Explanation: Any form of starch (carbohydrate) turns blue-black when iodine solution is applied to it. This is because starch is composed of polymers of ... already mentioned. The complex of iodine stuck inside the amylose coil produces a characteristic blueblack colour.
Description : potato tuber has been cut into two halves. A few drops of iodine solution are placed on the cut surface of one of the halves. What colour change will be noticed? (1) From brown to blue-black (2) From brown to orange-red (3) From blue to pink (4) From pink to blue-green
Last Answer : (1) From brown to blueblack Explanation: The Iodine test is used to test for the presence of starch. Iodine solution — iodine dissolved in an aqueous solution of potassium iodide — reacts with the starch producing a purple black colour.
Description : Green potato tuber is inedible due to: a. Carcinogenic b. Hardness c. Hollowness d. None of above
Last Answer : Carcinogenic
Description : Potato cut tuber are used for planting during a. Autumn crop b. Spring crop c. Both of above d. None of above
Last Answer : Spring crop
Description : Tuber initiation in potato starts after a. 7 th week b. 9 th week c. 5 th week d. 4 th week
Last Answer : 7 th week
Description : Optimum temperature for potato tuber formation is a. 20-22°C b. 25-30°C c. 22-25°C d. All of these
Last Answer : 20-22°C
Description : The edible part of potato is: a. Root b. Tuber c. Rhizome d. Corm
Last Answer : Tuber
Description : Potato tuber growth is stopped at what temperature ? (a) 40°C — 42°C (b) 30°C — 32°C (c) 35°C — 37°C (d) 38°C – 40°C
Last Answer : (b) 30°C — 32°C
Description : Damaging stage of potato tuber month is –a) Adult b) Pupa c) Larva d) All of these
Last Answer : c) Larva
Description : The “eyes” of the potato tuber are (a) root buds (b) flower buds (c) shoot buds (d) axillary buds.
Last Answer : (d) axillary buds.
Description : Herbicide which increase tuber size be sides weed control in potato a). EPTC b). Fluchloralin c). Pendimethalin d). Atrazine
Last Answer : a). EPTC
Description : A common example of stem tuber is a) Ginger b) Garlic c) Onion d) Potato
Last Answer : d) Potato
Description : Which of the following is not a stem modification ? (1) Bulb of Onion (2) Corm of Arvi (3) Tuber of Sweet-potato (4) Tuber of Potato
Last Answer : Tuber of Sweet-potato
Description : A potato tuber has been cut into two halves. A few drops of iodine solution are placed on the cut surface of one of the halves. What colour change will be noticed? (1) From brown to blue–black (2) From brown to orange–red (3) From blue to pink (4) From pink to blue–green
Last Answer : From brown to blue–black
Last Answer : From brown to blue-black
Description : Seed dormancy of potato tubers is broken by treating tubers with
Last Answer : Ans. Thiourea 1%
Description : Dormancy period in potato is about a. 2 Months b. 1 Month c. 3 Months d. ½ Month
Last Answer : 2 Months
Description : Potato dormancy can be broken through a. Chemical treatment b. Low temperature c. Both of these d. None of these
Last Answer : Both of these